Furnace



Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE.4

JOHN R. CLEVENGER AND RUTI-IERFORD B. MONFORT, OF WILMINGTON, OI-IIO, AS- SIGNORS TO THE FARQUHAR FURNACE COMPANY, OF WILMINGTON, OHIO, A COR- PORATION -OF OHIO.

FURNACE.

Application filed May 9, 1925. .Seria1 No. 29,056.

This invention relates to improvements in furnaces, particularly of the types used in heating residences.

The invention is in the nature ofan improvement on the furnaces set forth in Letters Patent No. 923,346, dated June 1, 1909,

for self-regulating furnaces, issued upon the application of Milton J. Farquhar and Henry B. Farquhar, assignors to The Fan quhar Furnace Company of llilmington,

Ohio, ourassignee of this present invention.

The object of the present improvements is to supply an additional and regulated quantity of air to the combustion chamber and above the fire box of the furnace set forth in said patent, such additional supply to be afforded at the time when the draft door of the furnace is closed to the exclusion of the admission of air into that part of the furnace. But it is to be understood that the present invention is not limited in its use to supplying such quantitiesl of air to the combustion chamber at that particular' time.

The purpose is to automatically introduce into the vcombustion chamber of the furnace regulated quantities of air to furnish the requisite amount of oxygen to mix with the gases of combustion arising from the fuel in the fire box to cause such gases to be com- 80 pletely consumed, and incidentally more or less of the smoke to be also consumed. This Vresults in increasing the heat without increasing the consumption of the solid fuel.

In the accompanying drawings:

' Figure 1 is a vertical longitudinal sectional view of a furnace of the type described and set forth in said Patent No.

Figure 2 is an enlarged side elevation of the air conduit, its Valve and a part of the means for operating the valve.

Figure 3 is a perspective view of the air conduit, its perforated or distributing section, and its valve. A

Referring tothe `drawings in detail, the numeral 1 designates the shell or casing of a domestic or house-warming furnace of the general type set forth in said Patent No. 923,346. This casing forms an enclosure made of side walls designated 2 which as they come together at their upper and lower edges thereby also form the top and bottom portions of this general type of furnace. The casing further comprises a head or front wall 3 and a rear wall t. The front wallA 3 is equipped with a door 5 for the introduction of fuel such as coal or wood, and a draft door (3 which when open permits a draft Aof air to enter the chamber 7 to. work itself thence between the grate bars 8 and the mass of fuel to excite and support combustion. Ashes gather in the chamber 7 and may be readily removed therefrom through t-he opening of door 6.

The lower part of the front wall 3 has an opening closed by va draft-check door 9 which when opened admits air into the smoke passage 10 and the smoke Hue 11 with the effect of checking the draft or cooling down the furnace somewhat. The Hue 11 connects with a smokeA pipe 12 which in turn extends to the chimney of thebuilding.

At the rear a further Wall 13 is provided to form a sort of enclosure for the'wall t of the combustion chamber. A y

It will now be observed that within the casing is a fire box `generally indicated at 14 with a baffle wall 15, a combustionchamber generally indicated at`16, and a down flue 17 leading` into the smoke passage 10.

Within this combustionV chamber we ex- -Ytend and position our air distributor com vdraft ofthe furnace draws the air into and through the distributor and causes the issuance of the air out of the perforations of which there may be as many and as many rows thereof as desired. The oxygenthus rsupplied unites with the gases arising from the combustion of the solid fuel and forms a gaseous fuel by which the otherwise waste gases, and by which also more or less of the smoke,are consumed, adding to the heat of the furnace without additional cost of fuel.

l/Ve provide any suit-able means for o pening the valve 23 to admit air to the distributor when the air draft door or control is closed, and for closing the distributor valve when the -air draft door or control is open. rThis is done because there is a suflicient supply of air when the passage 7 is receiving air, as when the door 6 is open, but when this is closed the distributor valve opens and permits the supply of air to the combustion chamber 16.

One means for thus automatically opening and closing the distributor valve consists of an actuating bar 24 hung loosely near the top of the furnace on a. bolt or pin 25. This bar is to be adjusted outward and inward so that by an outward movement it will open the door G by contact with the projection 6a thereof, and by an inward movement it will contact with the lever arm 2321 of the distributor valve so as to open 1t. A further movement of the bar will cause it to contact with the projection 9a of the door 9 to lift it and permit an indraft of air to check the too rapid burning of the fuel.

The means for so actuating the bar 24, which is a valve and door operating device, is that set forth in said patent No. 923,346. Briefly these means consist of a cross strip or plate 26 located at the rear of the furnace and having pins 27 which connect with the rear furnace wall 4. `When this wall eX- pands or contracts, according to the heat, it adjusts the plate and its pins rearwardly or forwardly. rlhe plate is connected by a 1ongit-udinal rod 28 with the bar 24:, so that if the heat rises above a general normal for which the furnace is adjusted, the bar 2i will open t-he valve 23 and maintain it open, while if the heat drops below such normal then the bar 24 will be adjusted outward from the furnace and by contacting with the projection 6a will open the door 6 and admit a draft of air to the grate bars to accelerate the fire. Then the heat comes back to substantially normal the bar 24 will move back in the direction of the furnace and cause or permit the door 6 to close. If the heat still continues to be excessive the bar will act on the projection 9@1 and open the check door 9. At such time as the bar 24: releases the door 6 the distributor valve is opened; or, indeed, at such time as the check door 9 is opened, the valve 23 is also opened.

Such is the preferred mode of operation, though it is to be understood that in so far as concerns the combination of our air distributor with the fire boX and combustion chamber of the furnace, the particular time and order of opening and closing the distributor valve is not to be regarded as a limitation.

Referring to Figure 2 it will be observed Iarising in the chamber, a valve for the dis- .expanding and contracting` part of the furthat the valve 23 is shown closed in full line position and open in dotted line positionh the two positions of the actuating bar 2t being also indicated in this enlarged scale\ in Figure 2, as also the two positions of the valve lever arm 23a. The valve is hinged to the distributor by means of a link 23b pivoted to the distributor at 23c and secured to the valve as by screws 23d.

It will now be seen that we have provided means for automatically admitting a supply of air from the outside of the furnace into the combustion chamber thereof, and for distributing the air in the chamber in a manner to permit of furnishing a regulated quantity of oxygen for admiXture with the gases arising from the combustion of the fuel, so as to create a gaseous fuel to increase the heat in the furnace without using additional quantities of purchasable fuel. Also. that we have shown one means for automati` cally opening and closing the valve of the air distributor. 7e have lfound from use that the invention here described operates successfully and efficiently and produces resuits valuable to the user of the furnaces.

-laving thus fully describedA our invention, what we claim as -new and desire to secure by Letters Patent, is:

In a furnace, a combination with a fire bor; having grate bars and a combustion chamber, of an air distributor comprising a horizontal perforated pipe extendingl through the furnace wall and located in the combustion chamber and over the fire box, and adapted to deliver air through the perforations into the products of combu-stion tributor located outside of said chamber, a 9 draft door and a chamber beneath the grate bars, and means for alternately opening and closing said valve and said door comprising an actuating bar also located outside of the furnace and adapted to contact with and open the valve when moved in one direction, and to contact with and open said door when moved in the other direction, Van

nace itself, a plate connected thereto, and

a connection between such plate and actuating bar to give the bar said movements.

In testimony whereof we affix our signatures.

JOHN R. CLEVENGER. RUTHERFORD B. MONFORT. 

